Hi Johnny, I was under the impression that for DFDSS DUMP, COMPRESS and HWCOMPRESS are synonymous;
Are you saying they are not? If you are writing to tape why not use the drive compaction(DCB=TRTCH=COMP) instead? Best Regards, Yifat -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Johnny Luo Sent: יום ה 02 דצמבר 2010 12:13 To: IBM-MAIN@bama.ua.edu Subject: Hardware-assisted compression: not CPU-efficient? Hi, DSS DUMP supports COMPRESS/HWCOMPRESS keyword and I found out in my test that HWCOMPRESS costs more CPU than COMPRESS. Is it normal? Currently we're dumping huge production data to tape and in order to alleviate the tape channel utilization we need to compress the data before writing to tape. It works well but the cpu usage is a problem cause we have many such backup jobs running simultaneously. If hardware-assisted compression cannot reduce the cpu overhead, I will consider using resource group to cap those jobs. Best Regards, Johnny Luo ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
